I got a decent deal on a cb500t tank on ebay. i have always liked the shape of this tank better than the stock 550 tank. It took some minor modification to get it to fit right, but it turned out good. You could use it without moving the petcock location, but moving it worked out better for me. I took a small hole saw and cut out the original threaded pipe, drilled a new hole and welded it in. There was a small plate spot welded to the inside of the tank in the original location which left a lip so i took and welded a flat round slug in that location.